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2 years ago

Is this right i dont know

Mathematics

1 answer:

adell [148]2 years ago

5 0

Answer:

Yes! Great Job

Step-by-step explanation:

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A fast food restaurant executive wishes to know how many fast food meals adults eat each week. They want to construct a 98% conf

adelina 88 [10]

Answer:

$n=(\frac{2.326(1.1)}{0.07})^2 =1336.006 \approx 1337$

So the answer for this case would be n=1337 rounded up to the nearest integer

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$\bar X$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

$\sigma=1.1$ represent the population standard deviation

n represent the sample size

Solution to the problem

The margin of error is given by this formula:

$ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (a)

And on this case we have that ME =0.07 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=(\frac{z_{\alpha/2} \sigma}{ME})^2$ (b)

The critical value for 98% of confidence interval now can be founded using the normal distribution. And in excel we can use this formula to find it:"=-NORM.INV(0.01;0;1)", and we got $z_{\alpha/2}=2.326$ , replacing into formula (b) we got:

$n=(\frac{2.326(1.1)}{0.07})^2 =1336.006 \approx 1337$

So the answer for this case would be n=1337 rounded up to the nearest integer

3 0

3 years ago

Katherine has $140 in the bank and is saving $6 per week. Abbie has $462 in the bank, but is spending at a rate of $10 per week.

ki77a [65]

<span>I think your answer is 140 + 6x = 462 - 10x
hope that helped!!</span>

3 0

3 years ago

Read 2 more answers

Explain why the rules called the algebraic order of operations are necessary for computation

AfilCa [17]

The rules are necessary, so that there is agreement as to how to evaluate an expression. By having rules, and having everyone follow the rules, an expression can have only one single correct value. If there are no rules, then different people will interpret the expression differently, and will get different values for its evaluation.

5 0

3 years ago

Mrs. Larson cuts 1 /3 of a piece of construction paper. She uses 1 /5 of the piece to make a flower. What fraction of the sheet

dusya [7]

Answer:

1/15

Step-by-step explanation:

X = a paper

Mrs. Larson cuts 1 /3 of a piece of construction paper.

1/3 * X = X/3

She uses 1 /5 of the piece to make a flower.

X/3 * 1/5 = X/15

What fraction of the sheet of paper does she use to make the flower?

1/15

3 0

3 years ago

[70 POINTS!] What is the volume of the pyramid? Explain your reasoning.

anzhelika [568]

Volume of cuboid=abc

Volume of prism :-

Area of base×Height
ab ×c
abc

Same volume i.e 39 units²

If a,b,c=a,b,c

6 0

2 years ago